mm: fix kcompactd hang during memory offlining

[deliverable/linux.git] / mm / compaction.c

diff --git a/mm/compaction.c b/mm/compaction.c
index ccf97b02b85f32d38f6f68a41bedf89b9a1ee596..8fa2540438015c1859724c606072a2770939d954 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -852,16 +852,8 @@ isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn,
                pfn = isolate_migratepages_block(cc, pfn, block_end_pfn,
                                                        ISOLATE_UNEVICTABLE);
 
-               /*
-                * In case of fatal failure, release everything that might
-                * have been isolated in the previous iteration, and signal
-                * the failure back to caller.
-                */
-               if (!pfn) {
-                       putback_movable_pages(&cc->migratepages);
-                       cc->nr_migratepages = 0;
+               if (!pfn)
                        break;
-               }
 
                if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
                        break;
@@ -1741,7 +1733,7 @@ void compaction_unregister_node(struct node *node)
 
 static inline bool kcompactd_work_requested(pg_data_t *pgdat)
 {
-       return pgdat->kcompactd_max_order > 0;
+       return pgdat->kcompactd_max_order > 0 || kthread_should_stop();
 }
 
 static bool kcompactd_node_suitable(pg_data_t *pgdat)
@@ -1805,6 +1797,8 @@ static void kcompactd_do_work(pg_data_t *pgdat)
                INIT_LIST_HEAD(&cc.freepages);
                INIT_LIST_HEAD(&cc.migratepages);
 
+               if (kthread_should_stop())
+                       return;
                status = compact_zone(zone, &cc);
 
                if (zone_watermark_ok(zone, cc.order, low_wmark_pages(zone),